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Are you sure you just want to learn and it has nothing to do with that nasty con-merchant of an installer trying to extract your hard earned? Because you're repeating the same question that has been answered. As mentioned before you are assuming the existing installation is correct. Proving him...

By quality do you mean Worcester? Because they are where they are today after years of the aforementioned practice for British Gas. Only not so much kick back as brown tongue.

What would you like to hear? Pipe size would be correct, no need to re-calculate perhaps. Why not install whatever boiler suits the existing pipework to save changing it.

Any good g4u. Or is it one of those schemes that after installing 300 Duo-Tecs, 50 Solos, 25 210ltr Megaflos and 10 of their re-branded Kensa heat pumps you can earn enough points to redeem them against a Baxi baseball cap worth £2.99 - produced in Laos for 0.005p (per box of 24)?

Yet more examples of peoples utter inability to grasp the simple equation of pressure and flow. Sometimes I think a pipe sizing chart should be branded on the forehead of those who continuously challenge this law of physics purely because they don't like the sound of the cost.

Because the combi might not be the same duty or the existing supply to the old boiler is initially undersized.

It'll be welded mild steel water jacket Agile. There were cast iron models such as Potterton BOA but 12 year old Camray is likely to be the 3 model for which jackets are obsolete.

I've nothing for or against them, but your suggestion that a £multi-million set up such as Vaillant, (which has sold many million appliances world-wide for over a hundred years) is out to scam you, coupled with an expectation that 10 years of system wear & tear (inc. a boiler designed for a 10...

I'd imagine you contact the hosts, negotiate rates and pay before you get a place to put the ad.

The tap problem is likely to be a restriction in the flow leading to it.

I'm afraid you may not see any financial saving. Furthermore if you choose a Trianco your installer might have to, at some stage, speak to their technical guy who's attitude makes you want to apply battery acid to his face.

The only person who can assess your husband's competence before attempting the job is your husband. However if you want an opinion from a stranger, I would describe a DIYer as someone who doesn't do it for a living but is able and knows or easily interprets what to do. Therefore they might only...

There is nothing wrong with asking the 'technical' questions and at 6'2" you sound big enough to understand what I'm getting at. Many people scoff at the prices they are given. Some from sheer misunderstanding, some from a dissatisfaction of others earning a crust. Then there are those that...

Then either go without heating or learn how to install it yourself but don't rely on your ignorance as a barometer for pricing.

You asked the question about evidence. Sales are evidence. No opinion was given by me about best, just most used (which was what you were asking for evidence about). As for last comment, if you read it says 'if you can't solder, not 'you can't solder'.

A non-return valve is a must unless the whole of the tank is above the burner. If you don't have one you will get problems. PS Watchdog is often used by those who expect to be compensated for living their life as a mug.

You asked the question. Seco wrote plumbers prefer solder to which you asked for evidence. The fact that solder is purchased hand over fist more than glue might lead people (though clearly not you) to assume that more is used (which answers your question). Unless it's being collected for...

A good place to start might be to obtain and compare sales figures for flux and solder with those of copper glue.

No

Softened water is not required or recommended in your CH system. It is only for HW/CW supplies.